Title:
ALIPHATIC POLYESTER COPOLYMER AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3353468
Kind Code:
B2
Abstract:
PURPOSE: To obtain a high-molecular-weight biodegradable aliphatic polyester copolymer having excellent mechanical strengths by polycondensing an aliphatic hydroxy acid with an aliphatic diol and an aliphatic dicarboxylic acid in a specified ratio.
CONSTITUTION: This copolymer mainly consists of 98-70mol% aliphatic hydroxycarboxylic acid units (O-R1-CO (wherein R1 is a bivalent aliphatic hydrocarbon group)), 1-15mol% aliphatic diol units [O-R2-O (wherein R2 is a bivalent aliphatic hydrocarbon group] and 1-15mol% aliphatic dicarboxylic acid units [OC-R3-CO](wherein R3 is a direct bond or a bivalent aliphatic hydrocarbon group)] and has a number-average molecular weight of 10000-150000. It is desirable that this copolymer is produced by directly polycondensing lactic acid with an aliphatic diol and an aliphatic dicarboxylic acid in the presence of a germanium compound or titanium compound as the catalyst.
Inventors:
Hiroshi Noguchi
Atsushi Kasai
Takayuki Ohta
Keiko Miyazaki
Yukiko Ishii
Atsushi Kasai
Takayuki Ohta
Keiko Miyazaki
Yukiko Ishii
Application Number:
JP14024194A
Publication Date:
December 03, 2002
Filing Date:
June 22, 1994
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
C08G63/06; C08G63/02; C08G63/60; C08G63/78; C08G63/82; C08L67/00; C08L101/16; (IPC1-7): C08G63/02
Domestic Patent References:
| JP5256194A | ||||
| JP5022079B1 |
Attorney, Agent or Firm:
Koji Hasegawa
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